When Mr Ken is 33 years old, his son is 7 years old. In how many years will he be 3 times as old as his son?
| |
Mr Ken |
His son |
Difference |
| Before |
33 |
7 |
26 |
| Change |
+ ? |
+ ? |
|
| After |
3 u |
1 u |
2 u |
The difference in the age between Mr Ken and his son at first and in the end remains the same.
Difference in the age between Mr Ken and his son
= 3 u - 1 u
= 2 u
2 u = 33 - 7
2 u = 26
1 u = 26 ÷ 2 = 13
Number of years' time so Mr Ken will be 3 times as old as his son
= 13 - 7
= 6
Answer(s): 6
